favorites in finder are gone

This is very odd. Some days ago I figured out that the icons in the favorites section in every finder window are gone. I tried to reactivate them from Finder preferences, they were already enabled. I deactivate them and activate them again without lucky.

I restart the computer, no success. It's very uncomfortable to navigate the disc without the favorites because I need to start from hard disk for every file I need.

Anybody know I to correct this? There is some configuration file I can delete or modify from the shell to reset the finder configuration? I'm using Catalina 10.15.5.